Liquid-fuel burner.



W. N. BEST.

LIQUID FUEL BURNER.

APPLICATION FILED JAN. 22. 1917.

m mw

Patented July 10, 1917.

2 SHEETS-SHEET 1- W. N. BEST.

LIQUID FUEL BURNER.

APPLICATION FILED JAN.22. 19w.

Lwgfififi. Patented July 10, 1917.

2 SHEETSSHEET 2.

Will/4,11 3 r1! 4 l/VI/EA/TOR BY W ATTOHIVEV WILLIAM H. BEST, OF NEW YORK, N. Y.

LIQUID-FUEL BURNER.

Specification of Letters Patent.

Patented July MI, 1191? Application filed J anuary 22, 1917. Serial No. 143,603.

State of New York, have invented certain new and useful Improvements in Liquid- Fuel Burners, of which the followlng 1s a specification This invention relates to certain improvements in liquid fuel burners and moreparticularly to a type adapted for use in open hearth furnaces for melting steel or other alloys or retaining the desired high temperature in other types of furnaces such as soaking pit furnaces, etc.

In an open hearth furnace, if the 011 1s delivered by placing, the burner in the rear wall of the regenerator end of the furnace, difliculty is experienced due to the fact that the burner itself becomes excessively hot, due to localized heat and the brick lining of the regenerator end burns out.

One object of my invention is to so design, support and place the burner that the atomized product may be delivered at a point between the air inlet ports and the metal bath, excessive localized heating avoided, and the heat more efficiently and effectively utilized.

Further objects of my invention are to maintain the temperature of the burner 1tself comparatively low to avoid excesslve heating of the burner and to providemeans by which the burner may be easily raised or lowered to different positions at the will of the operator or quickly removed from the furnace.

In the accompanyin drawings, to which reference is to be had, have illustrated one form which my invention may assume and have illustrated one type of furnace in connection with which that form ma. be employed. It will of course be obv1ous that various changes in the details of construction of the burner itself may be made within the scope of my invention asdefined in the appended claims and that the burner may be used with other types of furnaces than that illustrated. In these drawings, Figure 1 is a horizontal sectlon through the regenerator end of an open hearth furnace and showing my burner in position;

Fig. 2 is a central vertical section through the construction shown in Fig. 1;

Fig. 3 is a central longitudinal section through the burner itself upon a larger scale than that of Figs. 1 and 2;

Fig. 4 is an end view of the delivery end of the burner;

Fig. 5 is a transverse section on the line 5-5 of Fig. 3;

gig. 6 is an end view of the burner piping, an

Figs. 7 and 8 are front and side elevations of the burner support.

' I have illustrated my improved burner as mounted in the end wall of the reverberatory portion of an open hearth furnace. The furnace is illustrated as having a lining of fire brick or other refractory material externally supported and bound together by suitable tie-rods and I-beams. At one end of the body portion 10 which contains the metal to be melted or otherwise heat-treated is the mixing chamber and reverberatory portion 11. In the common construction in which the gas is used as the fuel, the gas enters said chamber through a centrally disposed passage 12 leading upwardly through the floor of said chamber and between two air inlet passages. The air and gas become mixed in the chamber 11 and pass downwardly toward the body portion 10. In applying my improved burner to this type of furnace, I support the burner adjacent to the outer surface of the end wall 14 and as an important feature I make it of such a len h that the atomized fuel is liberated at a point approximately midway between, the air inlet passages 13 and the metal containing body 10.

In the specific form of burner illustrated, I employ two concentric tubes 15 and 16, the inner one of which serves as a conduit for the atomized fuel while the annular space between the two serves as a circulating passage for cooling water. The two tubes 15 and 16 are held rigid in respect to each other and in spaced relationship at their inner ends by a nozzle member 17. This is shown as of annular form with two internally threaded, concentric, cylindrical flanges receiving the ends of the two tubes and having an annular chamber 18 communicating with and acting as an end for the annular space between the two tubes.

The central opening through the member 17 and which communicates with the passage through the inner tube 15is preferably contracted vertically and elongated horizontally so as to form an outlet or delivery slot 19 as is shown particularly in Fig. 4. The atomized fuel delivered through the conduit 15 as hereinafter described, by means of the formation of this slot, is projected in a flattened fan-shaped sheet directly toward or over the mass to be heated. The nozzle is back a sufficient distance from the mass of material to be treated so that the fan-shaped sheet at its point of engagement with or passage over the material is of a width approximatelyequal to the width of the chamber 10 so that the material is uniformly treated across its entire width.

The burner, as previously stated, projects through the end wall of the reverberatory portion of the furnace. Outside of the furnace, the two tubes are spaced and held rigid in respect to each other by an annular fitting 20. The inner tube 15 extends through a stuffing box 21 in the rear wall of the fitting, and supply and delivery conduits 22 and 23 for cooling water are connected to opposite sides of said fitting. Preferably, the supply conduit 22 is connected to a pipe 24 which extends lengthwise of the annular water chamber to a point adjacent the nozzle 17 so that the cooling water is delivered to said annular space near the nozzle 17 and can flow back through the, annular passageway to the outlet 23. In order to hold the conduits properly spaced intermediate of their ends, any suitable number of supporting set screws or other spacing means 25 may be employed. I have shown one such .construction in Fig. 5.

For supporting the burner and facilitating its adjustment, I provide a standard or,

bracket 26, one form of which is shown particularly in Figs. 7 and 8. This includes two vertically extending plates or flanges 27 spaced apart at their upper ends a sufficient distance to receive the tube 16 therebetween. The tube is provided with a collar 28 which may be adjusted lengthwise of the burner and has oppositely extending trunnions 29 seated in notches, sockets, or bearings, in the upper ends of the plates or flanges 27. At a short distance back from the collar 28, I provide a second collar 30 which may also be adjustable lengthwise of the tube 16 and which has a depending flange or pair of spac'ed flanges 31. A turn buckle 32 or other equivalent means adapted to be readily adjusted as to length connects the collar 30 and the base or lower end of the bracket 26 so thatby means of the said turn buckle the burner may be swung in a vertical plane, about the trunnions 29 as an axis.

For atomizing the liquid fuel and delivering it through the conduit 15- to the nozzle 17, I provide an atomizing device which is preferably of the general character shown in the patent to W. N. Best, Jr, No. 963,985,

issued July 12, 1910, or in'my prior Patent No. 752,195, issued February 16, 1904.

Oil, tar, or other liquid fuel is delivered through a conduit 33 and steam, compressed air or other atomizing fuel is delivered through a conduit 3-1 and across the fuel outlet. The mixture of atomized fuel and the atomized gaseous medium travels through the conduit 15 at high speed and becomes mixed even more fully than at the atomizer itself. The mixture is projected from the nozzle 17 in afan-shaped sheet as hereinbefore stated while the air constituting the main supporter of the combustion enters the chamber 11 through the conduits 13 and flows in the direction of the burner toward and past the nozzle 17 where the combustion takes place. This air, together with the jacket water, keeps the temperature of the burner from getting too high while the positioning of the nozzle substantially at the point indicated causes the main portion of the combustion to take place where it will operate to the best advantage on the mass to be treated.

By means of the turn buckle, the burner may be elevated or lowered in accordance with the character or mass of the material to be treated, while by adjusting the positions of the collars 28 and 30, the portion of the burner within the body of the furnace may be readily adjusted. It is of course evident that the conduits 15 and 16 may be made of various different lengths, depending upon the character of the furnace in connection with which the burner is to be employed. By means of the turn buckle, the burner may be quickly lowered until it is in such position that the trunnions may be lifted from their supports, the pin connecting the turn buckle to the collar 30 may be removed, and the burner may be quickly and easily removed from the furnace.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: I

1. A liquid fuel burner comprising a tube having a delivery nozzle at one end, an atomizer detachably secured to the opposite end for delivering a liquid fuel and a fuel atomizing gaseous medium to said tube, a water jacket encircling said tube, and extending from said nozzle to a point adjacent to but spaced from said atomizer, and means engaging with said water jacket for pivotally supporting said burner and permitting it to swing in a vertical plane.

2. In combination, a furnace having air inlet openings at one end, a burner projecting through the end wall to a point beyond said openings, a bracket outside of said furnace and pivotally supporting said burner, means connected to said burner in the rear of said bracket for swinging said burner in maapee liquid fuel and a fuel atomizing gaseous medium to the rear end of said burner, and a water jacket encircling said burner and extending to the inner end of the latter.

3. A liquid fuel burner including two concentric tubes, spaced apart to form a Water jacket therebetween, the inner tube being longer than the outer tube, an annular member connecting said'tubesat one end,-

and constituting a nozzle, a coupling including a packing connecting said members at the oppositeend of the outer tube and encircling the inner tube and having an'inlet and an outlet for-cooling waterto thejacket, and an atomizer detachably secured to one end of the inner tube and serving to deliver 7 an atomized liquid fuel and a fluid-atomiz ing gaseous medium through the inner tube to said nozzle.

4'. A liquid fuel burner including two concentric tubes spaced apart ,to form a water jacket therebetween, the inner tube being longer than the outer tube, an annular member connecting. said tubes at one endand constituting a nozzle, a coupling including apacking connecting said members at the opposite end of the outer tube and encircling the inner tube and having an inlet and an outlet for cooling Water to the jacket, an atomizer detachably secured to one end of the inner tube and serving to deliver an atomizedliquid fuel'and a fluid-atomizing gaseous medium through the inner tubeto said nozzle, a collar encircling said outer tube intermediate of its ends and presenting and means secured to said last mentioned collar'for tilting said burner upon its trunnions;

5. A liquid' fuel burner including a tube having a nozzle at one end, means for delivering liquid fuel and a fuel-atomizing gaseous medium to the opposite end, a pair of trunnions intermediate'of the ends of said tube, a brackethavinga pair of vertically disposed flanges receiving said tube therebetween and supporting said trunnions, and alink of adjustable length also secured between said flanges and secured to said tube in'the rear of said trunnions.

6. A liquid fuel burner including a pair of concentric tubes spaced apart to form a water jacket therebetween, ,anannular the inner tube.

Signed at New York, in the county of New York, and State of New York this 19th day of January, A. D. 1917.

, WILLIAM N.w BEST. 

